need help with jetting question

[killer454]

i put a fmf core 2 silancer on my nephews 05 blaster and it seams to be hanging on the throttle.(when you rev-it it takes a few seconds longer to return to idle)im pretty sure this means the exhaust is causing it to run lean.

we did not put the header on just the silencer.
it is all stock

do you guys think this silencer would need a bigger jet?
could i just try to raise the needle jet up another notch?
i tryed adjusting the air/fuel but no change

need some advice thanks

 

[islandbiker]

the silencer would not change anything, sounds like you might have an airleak somewhere. my blaster did that it had an airleak around the reed cage. if you spray some carb cleaner around your carb, if the motor revs up you have an air leak. that was my experience, i didnt seal if enough. but no the slip on wouldnt change anything.

 

[killer454]

thankyou islandbiker you was right my nephew did not get the top of the carb screwed all the way down.
that was the whole problem with it.
i gave you 2 rep points thanks